Hey @davidg51. I'll need more info to help you figure this out. Could you please share the system info of Photoshop from Help > System info > Copy & paste into a text document > attach here or upload to Creative Cloud files (https://assets.adobe.com/files) and share the link here?
Past reports of similar issues were linked to the screen's pixel dimension. To deduce if it is Photoshop, go to the location of the preference folder below and rename it to backup. https://helpx.adobe.com/photoshop/using/preferences.html
- Windows 10/11: Users/[user name]/AppData/Roaming/Adobe/Adobe Photoshop [version]/Adobe Photoshop [version] Settings
- Press Windows + R & type this is the Run Window - %APPDATA%\Adobe

- Rename the Adobe Photoshop folder by adding a .old at the end. (Adobe Photoshop 2023 > Rename > Adobe Photoshop 2023. old)
These changes will give a fresh start to Photoshop as a fresh install. Let me know how it goes.
Thanks!
Sameer K
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